Answer:
its c
Step-by-step explanation:
Answer:
1. 
2. 13.5 + 
3. 
6. 
These four options are rational;
Step-by-step explanation:
1.
equals to 10 * 10 = 100 which is rational
2. 13.5 +
equals 13.5 + 9 = 22.5
3.
-- 3+27 = 30
6. 
Option 4 and 5 are irrational because they include
and
which are not a perfect square and their answers will be non recurring and non terminating decimal fraction.
Answer:
Step-by-step explanation:
bghgytythghgf66ef
A because 12*4=48 and 32*4=128
Answer:
5040,56
Step-by-step explanation:
We have to construct pass words of 4 digits
a) None of the digits can be repeated
We have total digits as 0 to 9.
4 digits can be selected form these 10 in 10P4 ways (since order matters in numbers)
No of passwords = 10P4
= 
b) start with 5 and end in even digit
Here we restrain the choices by putting conditions
I digit is compulsorily 5 and hence only one way
Last digit can be any one of 0,2,4,6,8 hence 5 ways
Once first and last selected remaining 2 digits can be selected from remaining 8 digits in 8P2 ways (order counts here)
=56